Refrigeration equipment and refrigeration defrosting method thereof

Abstract

The invention provides refrigeration equipment and a refrigeration defrosting method of the refrigeration equipment. The refrigeration equipment comprises a box body with a refrigeration chamber and further comprises an evaporator assembly module, the evaporator assembly module comprises a shell, an evaporator and a fan assembly, and the evaporator and the fan assembly are arranged in the shell; air inlets and air outlets which are communicated with the refrigeration chambers are formed in the two ends of the shell respectively, the number of the air inlets and the number of the air outlets are matched with the number of the refrigeration chambers, and air doors for opening or closing the air outlets are arranged at the air outlets. And the air door controls whether the evaporator assembly module refrigerates a refrigeration chamber connected with the air outlet or not. The number of the air inlets and the air outlets in the shell is matched with the number of the refrigeration chambers, so that single refrigeration can be achieved, and odor tainting is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a refrigeration equipment and a refrigeration and defrosting method for the refrigeration equipment. Background Art

[0002] When a single-system refrigerator with two or more refrigeration compartments is cooling, multiple compartments pass through the evaporator at the same time, causing the cold air between the multiple compartments to circulate, causing the problem of refrigerator odor. Summary of the invention

[0003] The object of the present invention is to provide a refrigeration device and a refrigeration and defrosting method for the refrigeration device. An evaporator assembly module is arranged in the refrigeration device. The number of air inlets and air outlets arranged on its shell matches the number of refrigeration compartments. Whether the refrigeration compartment is refrigerated is controlled by a damper at the air outlet, thereby solving the problem of odor contamination in single-system refrigerators in the prior art.

[0004] In order to achieve one of the above-mentioned objects of the invention, an embodiment of the present invention provides a refrigeration device, comprising a box body formed with a refrigeration compartment, and also comprising an evaporator assembly module, the evaporator assembly module comprising a shell and an evaporator and a fan assembly arranged in the shell, the two ends of the shell are respectively provided with an air inlet and an air outlet connected to the refrigeration compartment, and the number of the air inlet and the air outlet matches the number of the refrigeration compartment, and the air outlet is provided with a damper for opening or closing the air outlet, and the damper controls whether the evaporator assembly module cools the refrigeration compartment connected to the air outlet.

[0005] As a further improvement of one embodiment of the present invention, the evaporator assembly module also includes a defrost heating wire arranged in the outer shell, a defrost air inlet and a defrost air outlet arranged in the outer shell and connected to the outside air, and a defrost air inlet damper and a defrost air outlet damper respectively arranged at the defrost air inlet and the defrost air outlet. The defrost heating wire is arranged close to the evaporator, and the defrost air inlet and the defrost air outlet are respectively arranged at two ends of the outer shell, so that the outside air enters the outer shell from the defrost air inlet under the action of the fan assembly, and the air flows through the evaporator and then flows out from the defrost air outlet.

[0006] As a further improvement of an embodiment of the present invention, the housing includes a shell and a back plate detachably connected to the shell, and the defrost air inlet and the defrost air outlet are opened on the back plate.

[0007] As a further improvement of one embodiment of the present invention, the box body includes a rear side wall formed on the rear side of the refrigeration device, the evaporator assembly module is arranged on the rear side of the box body, and the back plate is integrally arranged with the rear side wall of the refrigeration device.

[0008] As a further improvement of one embodiment of the present invention, the bottom of the shell protrudes away from the back plate to form a protruding portion, the air inlet is arranged at the bottom of the protruding portion, and the evaporator assembly module also includes an air inlet channel connected to the air inlet, and the air inlet channel is connected to the refrigeration chamber.

[0009] As a further improvement of an embodiment of the present invention, a baffle is arranged in the outer shell, the fan assembly includes a fan and a volute on which the fan is mounted, the volute includes an air inlet end and an air outlet end, and the air inlet end and the air outlet end are respectively arranged on both sides of the baffle.

[0010] As a further improvement of an embodiment of the present invention, the evaporator is arranged below the fan assembly, and a water receiving tray and a drainage pipe connected to the water receiving tray are arranged at the bottom of the housing.

[0011] An embodiment of the present invention further provides a refrigeration and defrosting method for a refrigeration device, wherein the refrigeration device is the refrigeration device as described above, and the refrigeration device is formed with three refrigeration compartments, including a refrigeration compartment, a freezing compartment, and a temperature-changing compartment. The refrigeration and defrosting method comprises the following steps:

[0012] Get cooling instructions;

[0013] Determine the number of refrigeration compartments that need to be refrigerated, and if the refrigeration compartment that needs to be refrigerated is one of the three refrigeration compartments, open the damper at the air outlet connected to the refrigeration compartment that needs to be refrigerated;

[0014] If the refrigeration compartments that need to be refrigerated are two or three of the three refrigeration compartments, the dampers at the air outlets communicating with the corresponding refrigeration compartments are opened according to the preset refrigeration sequence of the refrigeration compartments.

[0015] As a further improvement of an embodiment of the present invention, the refrigeration sequence of the preset refrigeration compartments is the refrigeration compartment, the temperature-changing compartment, and the freezing compartment.

[0016] As a further improvement of an embodiment of the present invention, the air inlet includes a refrigerated air inlet, a frozen air inlet and a variable temperature air inlet, the air outlet includes a refrigerated air outlet, a frozen air outlet and a variable temperature air outlet, and the air door includes a refrigerated air door, a frozen air door and a variable temperature air door;

[0017] After refrigeration, if a defrost command is received, the ambient temperature T ring is detected;

[0018] If the ambient temperature T ring is less than 16℃, the refrigeration damper, freezing damper, variable temperature damper, defrost air inlet damper and defrost air outlet damper are controlled to be closed, and the defrost heating wire is controlled to be opened to start heating and defrosting;

[0019] If the ambient temperature T ring ≥ 16 ℃, the refrigeration damper, freezing damper and temperature change damper are controlled to be closed, the defrost air inlet damper and defrost air outlet damper are controlled to be opened, and the fan is controlled to be turned on to use the heat in the environment for defrosting.

[0020] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0021] An evaporator assembly module is provided in the refrigeration device provided by the present invention, and the shell of the evaporator assembly module is provided with air inlets and air outlets having the same number as the refrigeration compartments, so that the evaporator assembly module can cool a single refrigeration compartment, thereby preventing cold air from circulating between multiple refrigeration compartments and causing odor in the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the coordination between the peripheral wall of the refrigeration equipment and the evaporator assembly module in an embodiment of the present invention.

[0023] Figure 2 yes Figure 1 Schematic cross-sectional view along line AA.

[0024] Figure 3 yes Figure 2 Enlarged view of point B in the middle.

[0025] Figure 4 This is a schematic diagram of the structure of the evaporator assembly module after removing the back plate.

[0026] Figure 5 It is a flow chart of a refrigeration and defrosting method for a refrigeration device in an embodiment of the present invention.

[0027] 10. Evaporator assembly module; 1. Shell; 11. Shell; 111. Protrusion; 1111. Refrigerated air inlet; 1112. Freezing air inlet; 1113. Variable temperature air inlet; 112. Refrigerated air outlet; 1121. Refrigerated air door; 113. Freezing air outlet; 1131. Freezing air door; 114. Variable temperature air outlet; 1141. Variable temperature air door; 12. Back plate; 121. Defrost air inlet; 1211. Defrost air inlet door; 122. Defrost air outlet; 1221. Defrost air outlet door; 2. Evaporator; 3. Fan assembly; 31. Fan; 32. Volute; 4. Defrost heating wire; 5. Water tray; 6. Drain pipe; 7. Baffle; 81. Refrigerated air inlet channel; 82. Freezing air inlet channel; 83. Variable temperature air inlet channel. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Terms such as "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used herein to indicate spatial relative positions are used for the purpose of convenience to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. Terms of spatial relative positions may be intended to include different orientations of the device in use or operation other than the orientation shown in the drawings.

[0030] For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] An embodiment of the present invention provides a refrigeration device, including a box body formed with a refrigeration compartment, and also including an evaporator assembly module 10, the evaporator assembly module 10 includes a shell 1 and an evaporator 2 and a fan assembly 3 arranged in the shell 1, and the two ends of the shell 1 are respectively provided with an air inlet and an air outlet connected to the refrigeration compartment, and the number of the air inlet and the air outlet matches the number of the refrigeration compartment. A damper for opening or closing the air outlet is provided at the air outlet, and the damper controls whether the evaporator assembly module 10 cools the refrigeration compartment connected to the air outlet.

[0033] The evaporator assembly module 10 of the refrigeration equipment provided in the embodiment of the present invention is provided with an air inlet and an air outlet matched with the number of refrigeration compartments. By controlling the air door at the air outlet, the evaporator assembly module 10 can cool the refrigeration compartment that needs to be refrigerated separately, thereby preventing the cold air between the refrigeration compartments from circulating with each other and causing the problem of refrigerator odor.

[0034] In this embodiment, the refrigeration equipment forms three refrigeration chambers, namely a refrigeration chamber, a freezing chamber and a temperature-changing chamber. Therefore, the air inlet includes a refrigeration air inlet 1111, a freezing air inlet 1112 and a temperature-changing air inlet 1113, the air outlet includes a refrigeration air outlet 112, a freezing air outlet 113 and a temperature-changing air outlet 114, and the air door includes a refrigeration air door 1121, a freezing air door 1131 and a temperature-changing air door 1141.

[0035] The cold air in the refrigerated room flows into the housing 1 through the refrigerated air inlet 1111, and after being cooled by the evaporator 2, it flows back to the refrigerated room from the refrigerated air outlet 112; the cold air in the freezer room flows into the housing 1 through the frozen air inlet 1112, and after being cooled by the evaporator 2, it flows back to the freezer room from the frozen air outlet 113; the cold air in the variable temperature room flows into the housing 1 through the variable temperature air inlet 1113, and after being cooled by the evaporator 2, it flows back to the variable temperature room from the variable temperature air outlet 114. For the convenience of observing the evaporator assembly module 10, Figure 1 Only the schematic diagram of the cooperation between the outer peripheral wall of the refrigeration equipment and the evaporator assembly module 10 is shown, and thus, the present invention does not show the refrigeration chamber, the freezing chamber and the temperature-changing chamber.

[0036] In this embodiment, the refrigerated air outlet 112, the frozen air outlet 113 and the variable temperature air outlet 114 are arranged at the top of the outer shell 1, the refrigerated air inlet 1111, the frozen air inlet 1112 and the variable temperature air inlet 1113 are arranged at the lower end of the outer shell 1, the fan assembly 3 is arranged at the top, and the evaporator 2 is arranged below the fan assembly 3. A defrost heating wire 4 is also arranged below the evaporator 2 for defrosting the evaporator 2. A water receiving tray 5 and a drain pipe 6 connected to the water receiving tray 5 are also arranged at the bottom of the outer shell 1 to discharge the defrost water of the evaporator 2 out of the evaporator assembly module 10.

[0037] Furthermore, the fan assembly 3 includes a fan 31 and a volute 32 on which the fan 31 is mounted. The volute 32 is provided with an air inlet end and an air outlet end. When the fan 31 rotates, air enters the volute 32 from the air inlet end and flows out of the volute 32 from the air outlet end. In this embodiment, the fan 31 is a vertically arranged centrifugal fan, so that the air inlet end of the volute 32 faces the horizontal direction and the air outlet faces upward. A baffle 7 is also provided in the housing 1, and the baffle 7 separates the air inlet end and the air outlet end of the volute 32 on both sides of the baffle 7 to prevent the air blown out from the air outlet end from entering the volute 32 from the air inlet end again under the action of the fan 31, resulting in turbulent air flow in the housing 1.

[0038] Furthermore, in addition to using the defrost heating wire 4 to defrost the frost generated by long-term refrigeration, the evaporator 2 can also use the hot air in the environment to defrost if the ambient temperature outside the refrigeration equipment is high. Therefore, the shell 1 of the evaporator assembly module 10 is also provided with a defrost air inlet 121 and a defrost air outlet 122 connected to the outside, and a defrost air inlet damper 1211 and a defrost air outlet damper 1221 are respectively provided at the defrost air inlet 121 and the defrost air outlet 122 to close the connection between the inside and outside of the evaporator assembly module 10 when defrosting using the defrost heating wire 4.

[0039] The defrost air inlet 121 and the defrost air outlet 122 are respectively arranged at both ends of the outer shell 1. Preferably, the defrost air inlet 121 is arranged at the end of the evaporator 2 away from the fan assembly 3, and the defrost air outlet 122 is arranged at the end of the fan assembly 3 away from the evaporator 2. The defrost air inlet 121 and the defrost air outlet 122 are arranged at both ends of the fan assembly 3 and the evaporator 2, so that the external hot air enters the outer shell 1 from the defrost air inlet 121 under the action of the fan 31, passes through the evaporator 2, and is blown out from the defrost air outlet 122 after heat exchange with the evaporator 2, thereby realizing defrosting of the external hot air.

[0040] For the evaporator assembly module 10, its housing 1 includes a shell 11 and a back plate 12 detachably connected to the shell 11, which is usually tightened by screws. The evaporator assembly module 10 is set at the rear side of the refrigeration equipment, and the back plate 12 is integrated with the rear side wall of the refrigeration equipment. When the components in the shell 1 are damaged, only the screws connecting the shell 11 and the back plate 12 need to be removed, and then the rear side wall of the refrigeration equipment can be removed to repair or replace the components in the shell 1. The evaporator assembly module 10 is at a certain distance from the refrigeration room, and the shell 1 is preferably made of thermal insulation material. When the defrosting heating wire 4 heats the defrosting, it has little effect on the temperature in the refrigeration room.

[0041] Furthermore, the defrost air inlet 121 and the defrost air outlet 122 are provided on the back plate 12 so that the evaporator assembly module 10 is directly connected to the outside air.

[0042] The lower end of the shell 1 protrudes away from one end of the back plate 12 to form a protruding portion 111, and the protruding portion 111 makes way for the water receiving tray 5 to set the air inlet. The refrigerated air inlet 1111, the frozen air inlet 1112 and the variable temperature air inlet 1113 are all arranged at the bottom of the protruding portion 111, and the evaporator assembly module 10 also includes an air inlet channel. For this embodiment, the air inlet channel includes a refrigerated air inlet channel 81, a frozen air inlet channel 82 and a variable temperature air inlet channel 83. The refrigerated air inlet channel 81, the frozen air inlet channel 82 and the variable temperature air inlet channel 83 are respectively connected to the refrigerated air inlet 1111, the frozen air inlet 1112 and the variable temperature air inlet 1113, and the refrigerated air inlet channel 81, the frozen air inlet channel 82 and the variable temperature air inlet channel 83 extend to the front end away from one end of the shell 1 and the opening gradually becomes larger to facilitate communication with the refrigerating chamber, the freezing chamber and the variable temperature chamber.

[0043] The embodiment of the present invention further provides a refrigeration and defrosting method for the aforementioned refrigeration equipment, comprising the following steps:

[0044] Get cooling instructions;

[0045] Determine the number of refrigeration compartments that need to be refrigerated, and if the refrigeration compartment that needs to be refrigerated is one of the three refrigeration compartments, open the damper at the air outlet connected to the refrigeration compartment that needs to be refrigerated;

[0046] If the refrigeration compartments that need to be refrigerated are two or three of the three refrigeration compartments, the dampers at the air outlets communicating with the corresponding refrigeration compartments are opened according to the preset refrigeration sequence of the refrigeration compartments.

[0047] When cooling a refrigeration system with three refrigeration compartments, various situations may occur, such as when only one compartment needs to be cooled:

[0048] When the refrigerating chamber needs to be cooled, the refrigerating damper 1121 is opened, and air flows from the refrigerating air inlet duct into the housing 1, passes through the evaporator 2 and the fan 31, and is blown back to the refrigerating chamber through the refrigerating air outlet 112 for cooling. When the freezing chamber needs to be cooled, the freezing damper 1131 is opened, and air flows from the freezing air inlet duct into the housing 1, passes through the evaporator 2 and the fan 31, and is blown back to the freezing chamber through the freezing air outlet 113 for cooling. When the variable temperature room needs to be cooled, the variable temperature damper 1141 is opened, and air flows from the variable temperature air inlet duct into the housing 1, passes through the evaporator 2 and the fan 31, and is blown back to the variable temperature room through the variable temperature air outlet 114 for cooling.

[0049] Alternatively, if two or three refrigeration compartments need to be refrigerated at the same time, if the corresponding damper is opened when the aforementioned refrigeration compartment is refrigerated, the air in the two or three refrigeration compartments will circulate with each other, causing the problem of refrigerator odor. Therefore, when two or three refrigeration compartments need to be refrigerated at the same time, they are refrigerated in a preset refrigeration order of the refrigeration compartments, preferably, in the order of the refrigeration compartment, the temperature-changing room, and the freezing compartment. For example, when the refrigeration compartment and the freezing compartment need to be refrigerated at the same time, the refrigeration damper 1121 is opened first to refrigerate the refrigeration compartment. When the temperature in the refrigeration compartment reaches the preset temperature, the refrigeration damper 1121 is closed, and the freezing damper 1131 is opened to refrigerate the freezing compartment.

[0050] After a long period of refrigeration, thick frost is generated on the evaporator 2, which affects the heat transfer. The evaporator 2 needs to be defrosted. If a defrost command is received, the ambient temperature T is detected. 环 ;

[0051] If the ambient temperature T 环 <16°C, the refrigeration damper 1121, the freezing damper 1131, the temperature-changing damper 1141, the defrost air inlet damper 1211, and the defrost air outlet damper 1221 are controlled to be closed, and the defrost heating wire 4 is controlled to be turned on to start heating and defrosting;

[0052] If the ambient temperature T 环 ≥16℃, the refrigeration damper 1121, the freezing damper 1131 and the temperature change damper 1141 are controlled to be closed, the defrost air inlet damper 1211 and the defrost air outlet damper 1221 are controlled to be opened, and the fan 31 is controlled to be opened, so as to utilize the heat in the environment for defrosting.

[0053] When the ambient temperature T 环 When the ambient temperature is low (T 环 <16℃), ambient temperature T 环 The temperature difference between the evaporator 2 and the environment is small, and the heat in the environment is not enough to melt the frost on the evaporator 2. Therefore, the defrost heating wire 4 is needed to heat and defrost. At this time, in order to avoid heat loss into the environment or diffusion into the refrigeration room causing the indoor temperature of the refrigeration room to rise, the refrigeration damper 1121, the freezing damper 1131, the variable temperature damper 1141, the defrost inlet damper 1211, and the defrost outlet damper 1221 need to be closed until the defrost is completed.

[0054] When the ambient temperature T 环 When the ambient temperature is high (T 环 ≥16℃), ambient temperature T 环There is a large temperature difference between the evaporator 2 and the environment, and the heat in the environment can help the evaporator 2 defrost. Therefore, the heat in the environment can be used to defrost, avoiding energy consumption caused by heating the heating wire. At this time, in order to prevent the heat in the environment from entering the refrigeration chamber, the refrigeration damper 1121, the freezing damper 1131, and the temperature-changing damper 1141 need to be closed, the defrosting air inlet damper 1211 and the defrosting air outlet damper 1221 need to be opened, and the fan 31 needs to be turned on, so that the air inside and outside the housing 1 circulates under the action of the fan 31, and the hot air in the environment exchanges heat at the evaporator 2 to achieve defrosting.

[0055] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0056] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A refrigeration device, comprising a box body having a refrigeration compartment, characterized in that: The invention also includes an evaporator assembly module, which includes a shell and an evaporator and a fan assembly arranged in the shell. The two ends of the shell are respectively provided with an air inlet and an air outlet connected to the refrigeration compartment, and the number of the air inlet and the air outlet matches the number of the refrigeration compartment. The air outlet is provided with a damper for opening or closing the air outlet, and the damper controls whether the evaporator assembly module cools the refrigeration compartment connected to the air outlet.

2. The refrigeration equipment according to claim 1, characterized in that: The evaporator assembly module also includes a defrost heating wire arranged in the shell, a defrost air inlet and a defrost air outlet arranged in the shell and connected to the outside air, and a defrost air inlet damper and a defrost air outlet damper respectively arranged at the defrost air inlet and the defrost air outlet. The defrost heating wire is arranged close to the evaporator, and the defrost air inlet and the defrost air outlet are respectively arranged at two ends of the shell, so that the outside air enters the shell from the defrost air inlet under the action of the fan assembly, and then flows out from the defrost air outlet after passing through the evaporator.

3. The refrigeration equipment according to claim 2, characterized in that: The housing comprises a shell and a back plate detachably connected to the shell, and the defrost air inlet and the defrost air outlet are arranged on the back plate.

4. The refrigeration equipment according to claim 3, characterized in that: The box body includes a rear side wall formed on the rear side of the refrigeration device, the evaporator assembly module is arranged on the rear side of the box body, and the back plate is integrally arranged with the rear side wall of the refrigeration device.

5. The refrigeration equipment according to claim 4, characterized in that: The bottom of the shell protrudes away from the back plate to form a protruding portion, the air inlet is arranged at the bottom of the protruding portion, and the evaporator assembly module also includes an air inlet channel connected to the air inlet, and the air inlet channel is connected to the refrigeration compartment.

6. The refrigeration equipment according to any one of claims 1 to 5, characterized in that: A baffle is arranged in the shell, the fan assembly includes a fan and a volute housing the fan, the volute includes an air inlet end and an air outlet end, and the air inlet end and the air outlet end are respectively arranged on both sides of the baffle.

7. The refrigeration equipment according to any one of claims 1 to 5, characterized in that: The evaporator is arranged below the fan assembly, and a water receiving tray and a drainage pipe connected to the water receiving tray are arranged at the bottom of the shell.

8. A refrigeration and defrosting method for refrigeration equipment, characterized in that: The refrigeration device is the refrigeration device according to any one of claims 2 to 5, and the refrigeration device is formed with three refrigeration compartments, including a refrigeration compartment, a freezing compartment and a temperature-changing compartment, and the refrigeration and defrosting method comprises the following steps: Get cooling instructions; Determine the number of refrigeration compartments that need to be refrigerated, and if the refrigeration compartment that needs to be refrigerated is one of the three refrigeration compartments, open the damper at the air outlet connected to the refrigeration compartment that needs to be refrigerated; If the refrigeration compartments that need to be refrigerated are two or three of the three refrigeration compartments, the dampers at the air outlets communicating with the corresponding refrigeration compartments are opened according to the preset refrigeration sequence of the refrigeration compartments.

9. The refrigeration and defrosting method for refrigeration equipment according to claim 8, characterized in that: The refrigeration order of the preset refrigeration rooms is the refrigerator, the temperature-changing room, and the freezer.

10. The refrigeration and defrosting method for refrigeration equipment according to claim 8, characterized in that: The air inlet includes a refrigerated air inlet, a frozen air inlet and a variable temperature air inlet, the air outlet includes a refrigerated air outlet, a frozen air outlet and a variable temperature air outlet, and the air door includes a refrigerated air door, a frozen air door and a variable temperature air door; After refrigeration, if a defrost command is received, the ambient temperature T 环 ; If the ambient temperature T 环 If the temperature is less than 16℃, the refrigeration damper, freezing damper, temperature-changing damper, defrost air inlet damper and defrost air outlet damper are closed, and the defrost heating wire is turned on to start heating and defrosting. If the ambient temperature T 环 If the temperature is ≥16℃, the refrigeration damper, freezing damper and variable temperature damper are closed, the defrost air inlet damper and defrost air outlet damper are opened, and the fan is turned on to use the heat in the environment for defrosting.

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